Mileage reimbursement is how your employer pays you back for using your personal vehicle on work-related trips, typically at a per-mile rate set against the IRS benchmark of 72.5 cents per mile for 2026.1Internal Revenue Service. 2026 Standard Mileage Rates – Notice 2026-10 No federal law forces private employers to reimburse at all, but when they do, IRS rules decide which miles qualify, what records you need to keep, and whether the payment lands in your pocket tax-free or shows up as taxable wages on your W-2.
Which Miles Qualify
The drive between your home and your regular workplace is commuting, and it never counts, no matter the distance.2Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Transportation Once you’re at work, driving from the office to a client site, a second work location, or an airport for a business trip does count.
Going straight from home to a client is the trickier case. The IRS treats that drive as business mileage if the destination is a temporary work location, meaning an assignment realistically expected to last a year or less. Drive to a temporary site and the full round trip from home is reimbursable. Once the assignment stretches past a year, or was always expected to, that location becomes your new tax home and the drive is personal commuting again.3Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Temporary Assignment
Personal detours don’t count either. If you leave the office for a client and stop at the grocery store on the way, the extra distance in and out of the store is personal. The direct business portion of the trip is still reimbursable, but you have to separate the two.4Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
The 2026 IRS Rate and Why It’s the Standard
The IRS publishes a business standard mileage rate each year that bundles fuel, maintenance, insurance, depreciation, and other operating costs into one per-mile figure. For 2026, that rate is 72.5 cents per mile, up from 70 cents in 2025.5Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile, Up 2.5 Cents Of that amount, the IRS treats 35 cents as depreciation.1Internal Revenue Service. 2026 Standard Mileage Rates – Notice 2026-10
Your employer can pick any rate it wants. The IRS figure works as a safe harbor: reimburse at or below 72.5 cents per mile under a properly structured plan and neither you nor your employer owes tax on the payment. Pay above that rate and the excess gets more complicated. Most companies just adopt the IRS number to avoid the paperwork.
Some employers use a Fixed and Variable Rate (FAVR) plan instead, splitting reimbursement into a fixed monthly amount for costs like insurance and depreciation plus a smaller per-mile rate for gas and maintenance. FAVR plans can be fairer to employees in high-cost areas or with newer vehicles, but they’re administratively heavier and less common.
How to Track and Document Your Miles
The IRS expects a contemporaneous log. That means recording each trip around the time it happens, not reconstructing the year in December. Every entry should include:
- The date
- Your starting point
- Your destination
- The business purpose
- Odometer readings at the start and end of the trip
The difference between the two readings gives you the distance.6Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses – Section: Table 5-2 Most employers provide an expense portal or standard form; a plain spreadsheet works if yours doesn’t. GPS-based mobile apps automate much of the tracking, though you still need to verify each trip is categorized correctly. An app that logs your Saturday grocery run as a business trip creates problems if anyone looks closely.
The IRS requires more documentation for vehicle expenses than for most other business items, so a log with all five elements is your strongest defense in an audit.7Internal Revenue Service. Burden of Proof Vague entries like “client meeting, 45 miles” without an address or odometer reading are exactly what examiners flag. Keep the records for at least three years from the date you file the return the reimbursement appears on.8Internal Revenue Service. Topic No. 305, Recordkeeping
Submitting the Claim and Getting Paid
The process is usually simple. You enter your mileage into whatever system your employer uses (SAP Concur, Expensify, or sometimes just a signed form emailed to accounting). A supervisor reviews the entries, often cross-checking reported distances against mapping software to make sure 12 miles didn’t somehow become 30. Approved claims move to payroll or accounts payable and typically pay out within one to two pay cycles.
Payment shows up either as a line item on your regular paycheck or as a separate direct deposit. Under a properly structured plan, the reimbursement is listed separately from wages and isn’t taxed. If it’s lumped in with your gross wages on your pay stub, that’s a sign your employer may be running a non-accountable plan, and you should check whether taxes are being withheld from the reimbursement.
Why Reimbursement Is Usually Tax-Free
Whether your reimbursement is taxable comes down to a single question: does your employer’s plan qualify as an accountable plan under IRS rules? If yes, the money is tax-free and never appears on your W-2. If no, it’s just extra wages.
An accountable plan has to meet three conditions:9eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
- Business connection. The expenses must relate to work you perform as an employee.
- Substantiation. You have to document each expense to your employer with the details covered above.
- Return of excess. If you get an advance or reimbursement bigger than your substantiated expenses, you have to give the difference back.
The IRS gives safe harbor deadlines: 60 days to substantiate an expense after you incur it, and 120 days to return any excess payment.10eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements – Section: Safe Harbors Reimbursements that meet all three conditions are excluded from your gross income and aren’t subject to income tax withholding or payroll taxes.11Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined
When the Rate Exceeds the IRS Standard
If your employer pays more than 72.5 cents per mile, the excess is treated as taxable wages unless the employer separately substantiates that the higher rate reflects actual costs. In practice, most employers that pay above the standard rate just run the overage through payroll, where it shows up on your W-2 subject to income tax and payroll tax withholding.
Non-Accountable Plans
Fail any of the three conditions and the entire reimbursement is taxable. Your employer reports the full amount as wages on your W-2, and both sides pay payroll taxes on it.11Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined That’s a worse outcome for everyone, which is why most employers bother to set up an accountable plan in the first place.
If Your Employer Doesn’t Reimburse You
No federal law requires private employers to reimburse business mileage. A handful of states, notably California, Illinois, and Massachusetts, do require employers to cover work-related vehicle expenses, though none set a specific per-mile rate. If you work in one of those states and your employer refuses, you may have a claim under state labor law.
There’s also a federal backstop through the Fair Labor Standards Act. If you’re a nonexempt employee and your unreimbursed vehicle costs push your effective pay below the federal minimum wage in any workweek, that’s an FLSA violation. The Department of Labor treats vehicle expenses incurred for the employer’s benefit (gas, oil changes, tire wear, depreciation on work trips) as costs that can’t eat into minimum wage or overtime pay.12U.S. Department of Labor. WHD Opinion Letter FLSA2020-12 This mostly affects lower-wage delivery drivers and similar roles where mileage is high relative to pay.
Deducting unreimbursed mileage on your federal return isn’t an option for most employees anymore. The Tax Cuts and Jobs Act of 2017 suspended the miscellaneous itemized deduction that used to cover it, and the One Big Beautiful Bill Act, signed on July 4, 2025, made the elimination permanent. A narrow group can still deduct: performing artists, Armed Forces reservists, fee-basis government officials, and employees with disability-related work expenses. Everyone else who pays out of pocket for work driving gets no federal tax relief.
A Note for Self-Employed Workers
If you’re self-employed, you don’t get reimbursed. You deduct vehicle expenses directly on Schedule C, choosing either the 72.5-cent standard mileage rate or the actual expense method, where you track every operating cost and deduct the business-use percentage.13Internal Revenue Service. Topic No. 510, Business Use of Car The rules covered above about accountable plans, W-2 treatment, and employer reimbursement don’t apply to you.